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Ultrasonic velocity and attenuation in a TaH0.51 hydride single crystal

Published online by Cambridge University Press:  03 March 2011

L. Di Masso ,
A. Biscarini ,
B. Coluzzi  and
F.M. Mazzolai
L. Di Masso
Affiliation:
Physics Department, University of Perugia, Perugia, Italy
A. Biscarini
Affiliation:
Physics Department, University of Perugia, Perugia, Italy
B. Coluzzi
Affiliation:
Physics Department, University of Perugia, Perugia, Italy
F.M. Mazzolai
Affiliation:
Physics Department, University of Perugia, Perugia, Italy
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Abstract

Ultrasonic propagation of longitudinal waves (CL mode) has been investigated as a function of temperature in a single crystal of a TaH0.51 hydride. Stepwise changes of the elastic constant CL and of the attenuation A have been observed in the vicinity of the β ↔ ∊ and ∊ ↔ α phase transitions. These changes occur over narrow temperature ranges corresponding to regions of coexistence of two phases. A relatively small temperature dependent softening is displayed by CL on approaching Tβ→∊ from the low temperature side. At the transition temperatures no divergency has been observed in the attenuation, which appears to originate from domain boundary motions, rather than from the transitions themselves. A determination of the H diffusion coefficient by a permeation method at high temperature supports a view that adiabatic tunneling is an effective mechanism even at temperatures as high as 1173 K.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 9 , September 1994 , pp. 2434 - 2439
Copyright
Copyright © Materials Research Society 1994

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